{"id":"USN-4797-1","summary":"libass vulnerabilities","details":"It was discovered that LibASS incorrectly handled certain ASS files. A remote\nattacker could possibly use this issue to cause a denial of service. One of\nthe issues, CVE-2016-7970, only affected Ubuntu 16.04 ESM.\n(CVE-2016-7969, CVE-2016-7970, CVE-2016-7972)\n\nIt was discovered that LibASS incorrectly handled parsing operations for\nspecific nested character strings. An attacker could possibly use this issue\nto cause a denial of service. This issue was only fixed in Ubuntu 16.04 LTS.\n(CVE-2020-24994)\n","modified":"2026-04-27T15:48:17.992839684Z","published":"2022-05-04T10:38:06Z","related":["UBUNTU-CVE-2016-7969","UBUNTU-CVE-2016-7970","UBUNTU-CVE-2016-7972","UBUNTU-CVE-2020-24994"],"upstream":["CVE-2016-7969","CVE-2016-7970","CVE-2016-7972","CVE-2020-24994","UBUNTU-CVE-2016-7969","UBUNTU-CVE-2016-7970","UBUNTU-CVE-2016-7972","UBUNTU-CVE-2020-24994"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4797-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-7969"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-7970"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-7972"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-24994"}],"affected":[{"package":{"name":"libass","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/libass@0.10.1-3ubuntu1+esm1?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.10.1-3ubuntu1+esm1"}]}],"versions":["0.10.1-1ubuntu1","0.10.1-3","0.10.1-3ubuntu1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"libass4","binary_version":"0.10.1-3ubuntu1+esm1"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2016-7969","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2016-7972","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:14.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4797-1.json"}},{"package":{"name":"libass","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libass@0.13.1-1ubuntu0.1~esm2?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.13.1-1ubuntu0.1~esm2"}]}],"versions":["0.12.3-2","0.13.0-1","0.13.1-1","0.13.1-1ubuntu0.1~esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"libass5","binary_version":"0.13.1-1ubuntu0.1~esm2"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2020-24994","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:16.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4797-1.json"}}],"schema_version":"1.7.5"}